# US 10,312,502 B2 · Lithium electrode and lithium secondary battery comprising same

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- Number: US 10,312,502 B2
- Document ID: US10312502B2
- Status: Granted
- Kind: B2
- Application number: 15/315,818
- Filed: 2015-06-15
- Published: 2017-04-13
- Granted: 2019-06-04
- Earliest claimed: 2014-06-13
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Byoungkuk Son; Minchul Jang; Kiyoung Kwon; Seong Ho Lee; Intae Park; Changhun Park; Junghun Choi
- Web page: https://patentgrep.com/patent/US10312502B2

## CPC

- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/366: {as layered products}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/625: {Carbon or graphite}
- H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres}
- H01M 4/76: Containers for holding the active material, e.g. tubes, capsules
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 2300/0025: Organic electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A lithium electrode including a porous carbon body; and a lithium metal inserted into pores of the porous carbon body is provided. The lithium electrode may include a lithium ion conductive protective layer formed on at least one surface of the porous carbon body. The lithium electrode can be used as a negative electrode in a lithium secondary battery.

## Claims

### Claim 1

A lithium electrode comprising:
a porous carbon body,
wherein the porous carbon body is in a form of a mesh, a foam, or a paper;
a lithium metal inserted into pores of the porous carbon body; and
a lithium ion conductive protective layer,
wherein the lithium ion conductive protective layer is in direct contact with at least one surface of the porous carbon body.

### Claim 2 (depends on 1)

The lithium electrode of claim 1, wherein a content of the lithium metal is 1 to 80 wt % based on a total weight of the porous carbon body and the lithium metal.

### Claim 3 (depends on 1)

The lithium electrode of claim 1, wherein the porous carbon body comprises at least one selected from activated carbon, graphite, graphene, carbon nanotubes (CNTs), carbon fiber, carbon black, and carbon aerosol.

### Claim 4 (depends on 1)

The lithium electrode of claim 1, wherein the porous carbon body has a porosity of 50 to 99%.

### Claim 5 (depends on 1)

The lithium electrode of claim 1, wherein the pores have an average particle diameter of 5 to 500 μm.

### Claim 6 (depends on 1)

The lithium electrode of claim 1, wherein the porous carbon body has a thickness of 200 μm or less.

### Claim 7 (depends on 1)

The lithium electrode of claim 1, wherein the lithium ion conductive protective layer comprises a material having a lithium ion conductivity of 10−7 S/cm or more.

### Claim 8 (depends on 1)

The lithium electrode of claim 1, wherein the lithium ion conductive protective layer comprises at least one selected from inorganic compounds and organic compounds.

### Claim 9 (depends on 8)

The lithium electrode of claim 8, wherein the inorganic compound is any one or a mixture of two or more selected from a group consisting of LiPON, hydride-based compounds, thio-LISICON-based compounds, NASICON-based compounds, LISICON-based compounds, and Perovskite-based compounds.

### Claim 10 (depends on 8)

The lithium electrode of claim 8, wherein the organic compound is selected from polyethylene oxide (PEO); polyacrylonitrile (PAN); polymethylmethacrylate (PMMA); polyvinylidene fluoride (PVDF); and a polymer comprising —SO3Li, —COOLi, or —OLi.

### Claim 11 (depends on 1)

The lithium electrode of claim 1, wherein the lithium ion conductive protective layer has a thickness of 0.01 μm to 5 μm.

### Claim 12 (depends on 1)

The lithium electrode of claim 1, wherein the lithium electrode has a thickness of 250 μm or less.

### Claim 13 (depends on 1)

A lithium secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte,
wherein the negative electrode is the lithium electrode of claim 1.

### Claim 14 (depends on 13)

The lithium secondary battery of claim 13, wherein the positive electrode comprises a positive electrode active material which is any one or a mixture of two or more selected from a group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2, and LiNi1-x-y-z,CoxM1yM2zO2 (M1 and M2 are each independently any one selected from a group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg, and Mo, and x, y, and z are each independently an atomic fraction of oxide composition elements, and 0≤x<0.5, 0≤y<0.5, 0≤z<0.5, and x+y+z≤1).

### Claim 15 (depends on 13)

The lithium secondary battery of claim 13, wherein the electrolyte comprises an organic solvent and an electrolyte salt.

### Claim 16 (depends on 15)

The lithium secondary battery of claim 15, wherein the organic solvent is any one or a mixture of two or more selected from a group consisting of ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate (FEC), dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethyl methyl carbonate (EMC), methyl propyl carbonate, ethyl propyl carbonate, dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether, ethyl propyl ether, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, and ε-caprolactone.

### Claim 17 (depends on 15)

The lithium secondary battery of claim 15, wherein the electrolyte salt comprises any one or two or more selected from a group consisting of F−, Cl−, Br−, I−, NO3−, N(CN)2−, BF4−, ClO4−, PF6−, (CF3)2PF4−, (CF3)3PF3−, (CF3)4PF2−, (CF3)5PF−, (CF3)6P−, CF3SO3−, CF3CF2SO3−, (CF3SO2)2N−,(FSO2)2N−, CF3CF2(CF3)2CO−, (CF3SO2)2CH−, (SF5)3C−, (CF3SO2)3C−, CF3(CF2)7SO3−, CF3CO2−, CH3CO2−, SCN−, and (CF3CF2SO2)2N−.